How to restore Fortigate firewall 110c to its default position.

I have a firewall Fortigate -110c. I was configuring firewall and i
did a mistake.

Firewall had the default static ip of 192.168.1.99 when I was started
making changes in configuration and I was made it on dhcp nd by
mistake. The moment I made the apply .... all of sudden the power
cable was unplugged by a little kid who was sitting besides me.

Now I am trying to recover the ip of Fortigate by putting up on lan. I
was configuring the firewall by using GUI (Windows) and I am not able
to go inside the firewall to reinstate it and configure the device.
I am unable to trace out which ip firewall is taking on and so that i
can take that ip and change the settings accordingly.
Is there any option there I can reset this Fortigate 110c firewall to
its original position?

I am trying hard to find out.the solution but not succeeded
yet. If you know the way to solution, please let me know how
I can sort this problem out as it's very urgent.

I have tried looking for some solutions on Google. I have found a lot
of solutions for installing and configuring the firewall but I haven't
found a single solution on how to reset the Fortigate firewall
110C.

If you have a small network, talk to the network admin and get them to look in DHCP to see what address was issued to the FortiGate. If that isn't possible, you could connect to the device using the serial cable that came with it to connect to the console port and use Putty or another program to change the settings using the command line.

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